Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
Home | Search | Notification | Authors | Submission | PIERS Home | EM Academy
Home > Vol. 106 > pp. 279-293


By Y. Li and H. Ling

Full Article PDF (381 KB)

We apply the ESPRIT algorithm to decompose the currents on a helical antenna into different traveling wave modes. The strengths, phase velocities and decay constants of the various modes are extracted across frequencies. Their contributions to the antenna performance including gain, polarization and time-domain radiated pulse shape are investigated. Our results show that the T0+ mode is a dominant contributor to the helix gain at the low end of the frequency band while the T1+ mode contributes significantly to the gain at higher frequencies. It is also found that the reflected current modes from the open end reduce the circular polarization purity of the helix. Lastly, it is observed that the T1+ and T0+ modes contribute constructively to a low-dispersion pulse from the antenna.

Y. Li and H. Ling, "Improved current decomposition in helical antennas using the ESPRIT algorithm," Progress In Electromagnetics Research, Vol. 106, 279-293, 2010.

1. Kraus, J. D., "Helical beam antennas for wide-band applications," Proc. IRE, Vol. 36, 1236-1242, Oct. 1948.

2. Kraus, J. D. and R. J. Marhefka, Antennas for All Applications, 3rd Edition, McGraw Hill, New York, 2002.

3. Nakano, H., Helical and Spiral Antennas --- A Numerical Approach, Wiley and Sons, New York, 1987.

4. Mayes, J. R., W. J. Carey, W. C. Nunnally, and L. Altgilbers, "The Marx generator as an ultra wideband source," Pulsed Power Plasma Science, 510, 2001.

5. Giri, D. V., J. S. Levine, F. M. Tesche, and Y. Rahmat-Samii, "Numerical modeling of helical antenna excited by transient waveforms," Directed Energy Test and Evaluation Conference, Albuquerque, NM, 2007.

6. Maclean, T. S. M. and R. G. Kouyoumjian, "The bandwidth of helical antennas," IRE Trans. Antennas Propagat., Vol. 7, 379-386, Dec. 1959.

7. Ghosh, S., A. K. Sinha, R. K. Gupta, S. N. Joshi, P. K. Jain, and B. N. Basu, "Space-harmonic effects in helical slow-wave structure --- An equivalent circuit analysis," Progress In Electromagnetics Research, Vol. 30, 85-104, 2001.

8. Marsh, J. A., "Current distributions on helical antennas," Proc. IRE, Vol. 39, 668-675, Jun. 1951.

9. Roy, R., A. Paulraj, and T. Kailath, "ESPRIT --- A subspace rotation approach to estimation of parameters of cisoids in noise," IEEE Trans. Acoust., Speech, Signal Processing, Vol. 34, 1340-1342, Oct. 1986.

10. Li, Y., H. Ling, M. Mayes, and J. Mayes, "Current decomposition in helical antennas using ESPRIT," IEEE Antennas Propagation Society International Symposium, 1237-1240, San Diego, CA, Jul. 2008.

11. Wang, Y. and H. Ling, "Multimode parameter extraction for multiconductor transmission lines via single-pass FDTD and signal-processing techniques," IEEE Trans. Microwave Theory Tech., Vol. 46, 89-96, Jan. 1998.

12. Li, Y. and H. Ling, "Extraction of wave propagation mechanisms in a cut-wire array using the ESPRIT algorithm," IEEE Antennas Wireless Propagat. Lett., Vol. 8, 744-747, May 2009.

13. Hurst, M. P. and R. Mittra, "Scattering center analysis via Prony's method," IEEE Trans. Antennas Propagat., Vol. 35, 986-988, Aug. 1987.

14. Schmidt, R. O., "Multiple emitter location and signal parameter estimation," IEEE Trans. Antennas Propagat., Vol. 34, 276-280, Mar. 1986.

15. Nakano, H., Y. Samada, and J. Yamauchi, "Axial mode helical antennas," IEEE Trans. Antennas Propagat., Vol. 34, 1143-1148, Sep. 1986.

16. Ghosh, D., A. De, M. C. Taylor, T. K. Sarkar, M. C. Wicks, and E. L. Mokole, "Transmission and reception by ultra-wideband (UWB) antennas," IEEE Antennas Propagation Magazine, Vol. 48, 67-99, Oct. 2006.

© Copyright 2014 EMW Publishing. All Rights Reserved